It was pretty much like the early Germanic migrants to UK who led a segregated life from natives and didn't mix (much) with them. Japanese commoners at that time didn't wear clothes, only nobles did.
If they were segregated, it does not make sense. Why were basic words vastly adopted from the Ainu and Malayo-Polynesian languages? In England, such adoption of words from the Celtic did not take place, did it?
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